Fix a leak with FPDFPageObj_NewImgeObj().

core/fpdfapi/fpdf_page/fpdf_page_doc.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_page/pageint.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 396 matching lines @@
     return it->second->AddRef();
 
   CPDF_Image* pImage = new CPDF_Image(m_pPDFDoc);
   pImage->LoadImageF(pImageStream->AsStream(), false);
 
   CPDF_CountedImage* pCountedImage = new CPDF_CountedImage(pImage);
   m_ImageMap[dwImageObjNum] = pCountedImage;
   return pCountedImage->AddRef();
 }
 
-void CPDF_DocPageData::ReleaseImage(const CPDF_Object* pImageStream) {
+bool CPDF_DocPageData::ReleaseImage(const CPDF_Object* pImageStream) {
   if (!pImageStream)
-    return;
+    return false;
 
   uint32_t dwObjNum = pImageStream->GetObjNum();
   if (!dwObjNum)
-    return;
+    return false;
 
   auto it = m_ImageMap.find(dwObjNum);
   if (it == m_ImageMap.end())
-    return;
+    return false;
 
   CPDF_CountedImage* pCountedImage = it->second;
   if (!pCountedImage)
-    return;
+    return false;
 
   pCountedImage->RemoveRef();
   if (pCountedImage->use_count() != 0)
-    return;
+    return false;
 
   delete pCountedImage->get();
   delete pCountedImage;
   m_ImageMap.erase(it);
+  return true;
 }
 
 CPDF_IccProfile* CPDF_DocPageData::GetIccProfile(
     CPDF_Stream* pIccProfileStream) {
   if (!pIccProfileStream)
     return nullptr;
 
   auto it = m_IccProfileMap.find(pIccProfileStream);
   if (it != m_IccProfileMap.end())
     return it->second->AddRef();
@@ skipping 88 matching lines @@
 }
 
 CPDF_CountedPattern* CPDF_DocPageData::FindPatternPtr(
     CPDF_Object* pPatternObj) const {
   if (!pPatternObj)
     return nullptr;
 
   auto it = m_PatternMap.find(pPatternObj);
   return it != m_PatternMap.end() ? it->second : nullptr;
 }